充粘液管材中超声纵向导波的无损检测参数选择  

Optimal parameters of ultrasonic guided waves non-destructive testing in viscous liquid-filled elastic pipes

作　　者：他得安[1] 刘镇清[2] 贺鹏飞[3] 

机构地区：[1]复旦大学电子工程系,上海200433 [2]同济大学声学研究所,上海200092 [3]同济大学工程力学系,上海200092

出　　处：《声学学报》2004年第2期104-110,共7页Acta Acustica

基　　金：国家自然科学基金(10074050);上海市博士后科学基金

摘　　要：对超声纵向导波在充粘液管材中的传播特性进行了分析。在假设实频率和复波数的基础上,计算了导波的频散曲线,得到并分析了导波在系统中的位移分布曲线和衰减系数分布曲线,以此确定了用各模式检测管材中缺陷的最佳频厚积范围和检测的最佳位置。分析结果表明:频厚积在0.07MHz·mm以下,用L(0,1)模式检测较为理想,检测管内壁缺陷时更灵敏;在0.09～0.16MHz·mm之间用L(0,2)模式检测及在0.18～0.28MHz·mm之间用 L(0,3)模式检测时较为理想。Describes an investigation of the ultrasonic longitudinal guided waves propagation characteristics in viscous liquid-filled elastic pipes is gives. The dispersion characteristics were computed on the assumption that the frequency is real number and wavenumber is complex number. Then the displacement amplitude distributions and the attenuation distributions of guided waves were obtained and analyzed. Finally, the optimal location and frequency-thickness products of testing for pipes are chose by using them. The results shown that below 0.07 MHz-mm, using L(0,1) mode to detect the defect of the pipes filled with viscous liquid should be more effective, especially for the inner wall of pipes. The optimal detect ranges of frequency-thickness products of L(0, 2) and L(0,3) modes are 0.09-0.16 MHz-mm, 0.18-0.28 MHz-mm, respectively.

关 键 词：超声纵向导波 充粘液管材 无损检测 参数选择 实频率 频散曲线 位移分布 衰减系数分布 

分 类 号：O426[理学—声学]